Lens



FIG. 1 is a front perspective view of a lens showing my new design.

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a left side elevational view thereof, the right side elevational view being a mirror image thereof;

FIG. 5 is a top plan view thereof; and,

FIG. 6 is a bottom plan view thereof.

The broken lines in the Figures show portions of the lens which form no part of the claimed design. 

CLAIM The ornamental design for a lens, as shown and described. 